161623330 has 32 divisors (see below), whose sum is σ = 320018688. Its totient is φ = 58767280.

The previous prime is 161623321. The next prime is 161623333. The reversal of 161623330 is 33326161.

161623330 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×161623330² = 52244201600577800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161623295 and 161623304.

It is not an unprimeable number, because it can be changed into a prime (161623333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7239 + ... + 19381.

It is an arithmetic number, because the mean of its divisors is an integer number (10000584).

Almost surely, 2^161623330 is an apocalyptic number.

161623330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161623330 is a deficient number, since it is larger than the sum of its proper divisors (158395358).

161623330 is a wasteful number, since it uses less digits than its factorization.

161623330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12183 (or 12161 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 25.

The square root of 161623330 is about 12713.1164550633. The cubic root of 161623330 is about 544.7133469974.

Adding to 161623330 its reverse (33326161), we get a palindrome (194949491).

The spelling of 161623330 in words is "one hundred sixty-one million, six hundred twenty-three thousand, three hundred thirty".